Expansion anchor

Abstract

An expansion anchor comprising a tubular body, which extends along a longitudinal axis and is structured so as to have a head at one end, adapted to be engaged inside a hole obtained in a wall; the head comprising a deformable body made of a first plastic material having a predetermined mechanical rigidity, and at least one longitudinal rigid insert, which is firmly integrated in the deformable body and is made of a second plastic material having a higher mechanical rigidity than the mechanical rigidity of the plastic material of the deformable body itself.

1. An expansion anchor, comprising
 a tubular body having a longitudinal axis; and 
 a head at one end of the tubular body and adapted to be engaged inside a hole obtained in a wall; 
 wherein said head comprises
 a deformable body made of a first plastic material having a predetermined mechanical rigidity, and 
 at least one longitudinal rigid insert, which is firmly integrated in said deformable body and is made of a second plastic material having a higher mechanical rigidity than the mechanical rigidity of the first plastic material of the deformable body, 
 
 wherein said deformable body comprises
 a first essentially cylindrical portion and a second essentially truncate-conical terminal portion, said at least one longitudinal rigid insert being defined by an essentially rectangular tab, which extends parallel to said axis so as to at least partially cross said first and second portions. 
 
 
     
     
       2. An anchor according to  claim 1 , wherein said head comprises two longitudinal rigid inserts, which are firmly integrated in the deformable body and at least partially penetrate said deformable body so as to extend inside along an essentially radial direction with respect to said axis. 
     
     
       3. An anchor according to  claim 2 , wherein said tab is embedded in said deformable body so that said rigid insert forms a single body with the deformable body. 
     
     
       4. An anchor according to  claim 1 , wherein said tubular body comprises
 a collar, and 
 a deformable, central cylindrical portion, which extends coaxially to the axis between said head and said collar and is made of said first plastic material. 
 
     
     
       5. An anchor according to  claim 4 , wherein said tubular body comprises a first reinforcing ring, which is made of said second plastic material and is arranged between said deformable, central cylindrical portion and said collar. 
     
     
       6. An anchor according  claim 5 , wherein said tubular body further comprises a second reinforcing ring, which is made of said second plastic material and at least partially coats said deformable body. 
     
     
       7. An anchor according to  claim 4 , wherein said deformable, central cylindrical portion has an at least partially indented external surface. 
     
     
       8. An anchor according to  claim 1 , wherein said tubular body comprises at least one pair of rigid, anti-rotation fins which extend parallel to said longitudinal axis and are made of the second plastic material. 
     
     
       9. An anchor according to  claim 1 , wherein said first plastic material has a mechanical rigidity defined by a flexural modulus which is higher than approximately 1500 Mega-Pascal and lower than 3000 Mega-Pascal. 
     
     
       10. An anchor according to  claim 1 , wherein said second plastic material has a mechanical rigidity defined by a flexural modulus which is higher than 3000 Mega-Pascal. 
     
     
       11. An expansion anchor comprising:
 a tubular body having a longitudinal axis; 
 a head, at one end of the tubular body, adapted to be engaged inside a hole obtained in a wall: 
 wherein said head comprises
 a deformable body made of a first plastic material having a predetermined mechanical rigidity, and 
 at least one longitudinal rigid insert, which is firmly integrated in said deformable body and is made of a second plastic material having a higher mechanical rigidity than the mechanical rigidity of the first plastic material of the deformable body, 
 
 wherein said tubular body comprises
 a collar, and 
 a deformable, central cylindrical portion, which extends coaxially to the axis between said head and said collar and is made of said first plastic material, and 
 wherein said deformable, central cylindrical portion has at least one pair of longitudinal through slots which extend along a direction which is essentially parallel to said longitudinal axis according to an essentially zigzag profile. 
 
 
     
     
       12. An anchor according to  claim 11 , wherein said slots comprises a first slot and a second slot,
 said first slot has a first pitch progressively increasing from the collar towards the head, and 
 said second slot has a pitch which progressively decreases from the collar towards the head. 
 
     
     
       13. An expansion anchor comprising
 a tubular body having a longitudinal axis; and 
 a head at one end of the tubular body and adapted to be engaged inside a hole obtained in a wall: 
 wherein said head comprises
 a deformable body made of a first plastic material having a predetermined mechanical rigidity, and 
 at least one longitudinal rigid insert, which is firmly integrated in said deformable body and is made of a second plastic material having a higher mechanical rigidity than the mechanical rigidity of the first plastic material of the deformable body, 
 
 wherein said tubular body comprises
 a collar, and 
 a deformable, central cylindrical portion, which extends coaxially to the axis between said head and said collar and is made of said first plastic material, and 
 at least one pair of rigid, anti-rotation fins which extend parallel to said longitudinal axis and are made of the second plastic material, and 
 wherein each said rigid fin includes 
 a main ridge which is parallel to said longitudinal axis, and 
 a series of transversal reinforcing segments, which are fixed to the external surface of said cylindrical portion and extend orthogonally to said main ridge. 
 
 
     
     
       14. An expansion anchor comprising
 a tubular body having a longitudinal axis; and 
 a head at one end of the tubular body and adapted to be engaged inside a hole obtained in a wall: 
 wherein said head comprises
 a deformable body made of a first plastic material having a predetermined mechanical rigidity, and 
 at least one longitudinal rigid insert, which is firmly integrated in said deformable body and is made of a second plastic material having a higher mechanical rigidity than the mechanical rigidity of the first plastic material of the deformable body, 
 
 wherein said tubular body comprises
 a collar, and 
 a deformable, central cylindrical portion, which extends coaxially to the axis (A) between said head and said collar and is made of said first plastic material, 
 at least one pair of rigid, anti-rotation fins which extend parallel to said longitudinal axis and are made of the second plastic material, 
 a first reinforcing ring, which is made of said second plastic material and is arranged between said deformable, central cylindrical portion and said collar, and 
 a second reinforcing ring, which is made of said second plastic material and at least partially coats said deformable body, and 
 wherein said rigid anti-rotation fins are firmly fixed to said first and second reinforcing rings.